v2.3.0-beta

Persist output preferences across reopens; clearer conversion toggle labels.

• Bug fix: The output toggle (Result only / Full record) was resetting to "Result only" every time the calculator was reopened. Preferences for stamp mode, decimal places, and thousands separator now persist for the duration of the app session.
• UX improvement: In Conversion mode the output toggles are now labelled "No label" / "With label" instead of "Result only" / "Full record", making it clear whether the category prefix (e.g. Length:) will be included in the stamped text.